algebra question!!!

[BigJimbo]

help!!

7-7i / 5+4i


a 63 +7i / 41
b 63 +63i / 9
c 7+63i / 9
d 7-63i /41

 

[Need4Speed]

do your own homework

 

[ggavinmoss]

Just to clarify, is that (7-7i) / (5+4i) or 7 - (7i / 5) + 4i ?

-geoff

 

[dxkj]

a

 

[pandego]

He's talking about imaginary numbers. 5+3i is a vector, right?

 

[IceBlue]

D.


multiply by (5-4i)/(5-4i), use the FOIL method and then simplify to end up with D



-Ice

 

[dxkj]

Hrm, can you explain how you got that? I got a, but that was by cheating 😉

when multiplying by that I got

(35+7i-28i^2)/(25-16i^2)

 

[Luagsch]

Originally posted by: dxkj
Hrm, can you explain how you got that? I got a, but that was by cheating 😉

when multiplying by that I got

(35+7i-28i^2)/(25-16i^2)

what is i^2 ? *wink wink* 😉

 

[ggavinmoss]

Originally posted by: IceBlue
D.


multiply by (5-4i)/(5-4i), use the FOIL method and then simplify to end up with D



-Ice

I did this too.

-geoff

 

[InverseOfNeo]

Originally posted by: Luagsch

Originally posted by: dxkj
Hrm, can you explain how you got that? I got a, but that was by cheating 😉

when multiplying by that I got

(35+7i-28i^2)/(25-16i^2)

what is i^2 ? *wink wink* 😉

-1?

 

[ethebubbeth]

what is i^2 ? *wink wink* 😉

heheheh 🙂

 

[dxkj]

nm, I thought i = variable not i = imaginary.


my bad 🙂

 

[dxkj]

it is still A isnt it?